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homogeneous turbulence model for inhomogeneous multiphase flow simulations？ |
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March 4, 2018, 21:51
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homogeneous turbulence model for inhomogeneous multiphase flow simulations？
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#1 |
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New Member
Terry
Join Date: Jan 2018
Posts: 16
Rep Power: 8  |
Hi friends!
Why cfx will recommend me to select homogeneous turbulence model for inhomogeneous multiphase flow simulations？ It said"It is recommended that a homogeneouos turbulence model is used for inhomogeneous multiphase simulations with more than one continuous phase" |
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March 5, 2018, 05:33
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#2 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,870
Rep Power: 144 |
Where does it say that?
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Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum. |
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March 6, 2018, 01:32
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#3 | |
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New Member
Terry
Join Date: Jan 2018
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Quote:
It said: For flows in which the phases tend to separate (for example, inhomogeneous free surface flows and oil-water separators), the homogeneous turbulence model is recommended. Obviously, oil and water are not two mutually soluble liquids, why homogeneous turbulence model is recommened? Thanks |
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March 6, 2018, 05:24
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#4 |
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Senior Member
Gert-Jan
Join Date: Oct 2012
Location: Europe
Posts: 1,928
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Homogeneous means that CFX will apply the same turbulence model in each phase. So laminar, k-e, SST, RSM, whatsoever: in both phases the same turbulence model. For a case where oil and water are separated (inhomogeneous), it is safe to use this.
You can overrule this if you want. If you have good reasons to do so, |
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March 7, 2018, 00:22
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#5 | |
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New Member
Terry
Join Date: Jan 2018
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Quote:
Oh I see now. That means each phase will obey the same turbulence model, isn't it? Thanks for your detailed explaination! |
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March 7, 2018, 00:52
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#6 |
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Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,870
Rep Power: 144 |
It means more than sharing the same turbulence model. It means all phases will share the same turbulence field as well. So if one phase has k=10 at some location then all phases have k=10 at that location.
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March 7, 2018, 02:00
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#7 | |
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New Member
Terry
Join Date: Jan 2018
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Quote:
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